[Feature] Add percentage thresholds

[manupomax]

Thanks for the amazing work you have done, you have improved very much the original plugin.

If possible I think that a very good feature would be to add the possibility to select a percentage threshold like in the "Table" plugin, for example

the current behaviour is limited to an absolute numeric threshold that is not suitable if you want to update dinamically the map

thank you very much for the hard work

Emanuele

[manupomax]

My use case is very simple:

I have a map where I want to show different quantities based on the selection of a dashboard variable, each quantity is different and not related to the others so there is no way with the current plugin to set a meaningful threshold for each quantity.

The only workarounds would be to build as many maps as variable values (which is not very practical when you want to show for example 15 different variables...) or to normalize the values in the sql query, but the second option does not allow you to see the actual values.